theorem Th61: :: CQC_THE2:61

for A being QC-alphabet
for p, q being Element of CQC-WFF A
for x being bound_QC-variable of A holds
( (Ex (x,(p => q))) => ((All (x,p)) => (Ex (x,q))) is valid & ((All (x,p)) => (Ex (x,q))) => (Ex (x,(p => q))) is valid )